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Real-time measurements of the differences in inhaled and exhaled, unlabeled and fully deuterated acetone concentration levels, at rest and during exercise, have been conducted using proton transfer reaction mass spectrometry. A novel approach to continuously differentiate between the inhaled and exhaled breath acetone concentration signals is used. This leads to unprecedented fine grained data of inhaled and exhaled concentrations. The experimental results obtained are compared with those predicted using a simple three compartment model that theoretically describes the influence of inhaled concentrations on exhaled breath concentrations for volatile organic compounds with high blood:air partition coefficients, and hence is appropriate for acetone. An agreement between the predicted and observed concentrations is obtained. Our results highlight that the influence of the upper airways cannot be neglected for volatiles with high blood:air partition coefficients, i.e. highly water soluble volatiles.
Verstärkt der Handel mit Agrar-Derivaten die Preisschwankungen von Agrar-Produkten? In der politischen Diskussion wird diese These oft als Grund für eine strenge Reglementierung des Handels mit Agrar-Derivaten angeführt. Hier diskutiere ich die Voraussetzungen, auf denen verschiedene Argumente für diese These beruhen. Eine zentrale Rolle dabei spielen die Begriffe von Gleichgewicht und Selbstreferenz. Diese Begriffe spielen in der Logik und der Physik eine wichtige Rolle, haben aber in der Ökonomie erstaunliche Konsequenzen.